EP1077387A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Liquid crystal projector
Assignee: Sony Corp
•
Filing: 2000-07-26
•
Granted: —
•
Expires: 2020-07-26
Abstract
Abstract A liquid crystal projector providing an image having a high luminance and excellent contrast, including a polarization plate (30) which is arranged at an incident side of a liquid crystal panel (32) and transmits a first polarized beam therethrough, a polarization plate (33) which is arranged at an exit side of the liquid crystal panel and transmits an optically modulated second polarized beam therethrough and outputs the same to a projection lens, and a phase difference film (31) having one of a phase delay axis or a phase forward axis which is orthogonal to the polarization axis of the polarization plate and arranged inclined at a predetermined angle about an axis of rotation comprising an axis parallel to the polarization axis of the polarization plate in the plane in which said phase delay axis or phase forward axis is formed.
Inventors
- 👤 Yoshiki c/o Sony Corporation Shirochi
- 👤 Keiichi c/o Sony Corporation Nito
- 👤 Yoshio c/o Sony Corporation Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-05 10:21
CPC Classifications
G; G03; G03B; G03B21/00; G02; G02B; G02B27/00; G02B27/10; G02B27/14; G02B27/145; G02B27/149; G02B5/00; G02B5/30; G02B5/3083; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/13363; G02F1/133632; H; H04; H04N; H04N9/00; H04N9/12; H04N9/31; H04N9/3102; H04N9/3105
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
195 words
A liquid crystal projector comprising: a light source; an illumination optical system for converging
the light emitted from said light source to a required
optical path; a liquid crystal panel for optically modulating
the light converged by said illumination optical system; a projection lens for magnifying and projecting
the light modulated by said liquid crystal panel; a first polarization plate which is arranged at
an incident side of said liquid crystal panel and
transmits a first polarized light converged by said
illumination optical system therethrough; a second polarization plate which is arranged
at an exit side of said liquid crystal panel, transmits a
second polarized light modulated by said liquid crystal
panel therethrough, and outputs the same to said
projection lens; and a phase difference means having one of a phase
delay axis or a phase forward axis which is orthogonal to
a polarization axis of said first or second polarization
plate and arranged inclined by a predetermined angle
about an axis of rotation comprised of an axis parallel
to the polarization axis of said first or second
polarization plate in the plane in which said phase delay
axis or phase forward axis is formed.
Claim 2
Dependent Claim
84 words
A liquid crystal projector as set forth in
claim 1, wherein said phase difference means is arranged
between said first polarization plate and said liquid
crystal panel with one of its phase delay axis or phase
forward axis orthogonal to the polarization axis of the
first polarization plate and inclined by a predetermined
angle about an axis of rotation comprised of an axis
parallel to the polarization axis of the first
polarization plate in the plane in which the phase
difference means is formed.
Claim 3
Dependent Claim
153 words
A liquid crystal projector as set forth in
claim 1, wherein said phase difference means comprises: a first phase difference means arranged between
said first polarization plate and said liquid crystal
panel with one of its phase delay axis or phase forward
axis orthogonal to the polarization axis of the first
polarization plate and inclined by a predetermined angle
about an axis of rotation comprised of an axis parallel
to the polarization axis of the first polarization plate
in the plane in which the phase difference means is
formed, and a second phase difference means arranged with
one of its phase delay axis or phase forward axis
orthogonal to the polarization axis of the second
polarization plate and inclined by a predetermined angle
about an axis of rotation comprised of an axis parallel
to the polarization axis of the second polarization plate
in the plane in which the phase difference means is
formed.
Claim 4
Dependent Claim
84 words
A liquid crystal projector as set forth in
claim 1, wherein said phase difference means is arranged
between said liquid crystal panel and said second
polarization plate with one of its phase delay axis or
phase forward axis orthogonal to the polarization axis of
the second polarization plate and inclined by a
predetermined angle about an axis of rotation comprised
of an axis parallel to the polarization axis of the
second polarization plate in the plane in which the phase
difference means is formed.
Claim 5
Dependent Claim
153 words
A liquid crystal projector as set forth in
claim 1, wherein said phase difference means comprises: a first phase difference means arranged between
said liquid crystal panel and said second polarization
plate with one of its phase delay axis or phase forward
axis orthogonal to the polarization axis of the first
polarization plate and inclined by a predetermined angle
about an axis of rotation comprised of an axis parallel
to the polarization axis of the first polarization plate
in the plane in which the phase difference means is
formed, and a second phase difference means arranged with
one of its phase delay axis or phase forward axis
orthogonal to the polarization axis of the second
polarization plate and inclined by a predetermined angle
about an axis of rotation comprised of an axis parallel
to the polarization axis of the second polarization plate
in the plane in which the phase difference means is
formed.
Claim 6
Dependent Claim
163 words
A liquid crystal projector as set forth in
claim 1, wherein said phase difference means comprises: a first phase difference means arranged between
said first polarization plate and said liquid crystal
panel with one of its phase delay axis or phase forward
axis orthogonal to the polarization axis of the first
polarization plate and inclined by a predetermined angle
about an axis of rotation comprised of an axis parallel
to the polarization axis of the first polarization plate
in the plane in which the phase difference means is
formed, and a second phase difference means arranged
between said liquid crystal panel and said second
polarization plate with one of its phase delay axis or
phase forward axis orthogonal to the polarization axis of
the second polarization plate and inclined by a
predetermined angle about an axis of rotation comprised
of an axis parallel to the polarization axis of the
second polarization plate in the plane in which the phase
difference means is formed.
Claim 7
Dependent Claim
38 words
A liquid crystal projector as set forth in
claim 1, wherein said phase difference means is obtained
by superposing a plurality of rectangular films and
cutting them in that state along an inclination direction
of said predetermined angle.
Claim 8
Dependent Claim
69 words
A liquid crystal projector as set forth in
claim 1, wherein said phase difference means comprises a
first phase difference means and a second phase
difference means cut along an inclination direction of a
predetermined angle, alternately adjoining in the
inclined states, and arranged so that the phase delay
axis of the first phase difference means and the phase
forward axis of the second phase difference means become
parallel.
Claim 9
Dependent Claim
62 words
A liquid crystal projector as set forth in
claim 1, wherein said phase difference means is held by a
phase adjustment means having a center portion of said
phase difference means in the direction of transmission
of light as a first axis of rotation and having one of
the phase delay axis or phase forward axis as a second
axis of rotation.
Claim 10
Dependent Claim
58 words
A liquid crystal projector as set forth in
claim 1, wherein a main light beam of illumination light
illuminated from said illumination optical system to said
liquid crystal panel is inclined with respect to a normal
line of said liquid crystal panel in accordance with an
angle of inclination of said phase delay axis or phase
forward axis.
Claim 11
Dependent Claim
37 words
A liquid crystal projector as set forth in
claim 1, wherein said angle of inclination of said phase
delay axis corresponds to the angular distribution of
light of the illumination optical system illuminating the
liquid crystal panel.
Claim 12
Dependent Claim
157 words
A liquid crystal projector comprises: a light source; an illumination optical system for converging
the light emitted from said light source to a required
optical path; a liquid crystal panel for optically modulating
the light converged by said illumination optical system; a projection lens for magnifying and projecting
the light modulated by said liquid crystal panel; a first polarization plate which is arranged at
an incident side of said liquid crystal panel and
transmits a first polarized light converged by said
illumination optical system therethrough; a second polarization plate which is arranged
at an exit side of said liquid crystal panel; transmits a
second polarized light modulated by said liquid crystal
panel therethrough, and outputs the same to said
projection lens; and an optical compensating means which has a phase
delay axis in a required axial direction which is
arranged at a required angle with respect to the
polarization axis of said first or second polarization
plate.
Claim 13
Dependent Claim
54 words
A liquid crystal projector as set forth in
claim 12, wherein said optical compensating means is
arranged between said first polarization plate and said
liquid crystal panel with one of its phase delay axis or
phase forward axis inclined by a required angle with
respect to the polarization axis of the first
polarization plate.
Claim 14
Dependent Claim
93 words
A liquid crystal projector as set forth in
claim 12, wherein said optical compensating means
comprises: a first optical compensating means arranged
between said first polarization plate and said liquid
crystal panel with one of its phase delay axis or phase
forward axis inclined by a required angle with respect to
the polarization axis of the first polarization plate,
and a second optical compensating means arranged
with one of its phase delay axis or phase forward axis
inclined by a required angle with respect to the
polarization axis of the second polarization plate.
Claim 15
Dependent Claim
54 words
A liquid crystal projector as set forth in
claim 12, wherein said optical compensating means is
arranged between said liquid crystal panel and said
second polarization plate with one of its phase delay
axis or phase forward axis inclined by a required angle
with respect to the polarization axis of the second
polarization plate.
Claim 16
Dependent Claim
93 words
A liquid crystal projector as set forth in
claim 12, wherein said optical compensating means
comprises: a first optical compensating means arranged
between said liquid crystal panel and said second
polarization plate with one of its phase delay axis or
phase forward axis inclined by a required angle with
respect to the polarization axis of the first
polarization plate, and a second optical compensating means arranged
with one of its phase delay axis or phase forward axis
inclined by a required angle with respect to the
polarization axis of the second polarization plate.
Claim 17
Dependent Claim
93 words
A liquid crystal projector as set forth in
claim 12, wherein said optical compensating means
comprises: a first optical compensating means arranged
between said first polarization plate and said liquid
crystal panel with one of its phase delay axis or phase
forward axis inclined by a required angle with respect to
the polarization axis of the first polarization plate,
and a second optical compensating means arranged
with one of its phase delay axis or phase forward axis
inclined by a required angle with respect to the
polarization axis of the second polarization plate.
Claim 18
Dependent Claim
44 words
A liquid crystal projector as set forth in
claim 12, wherein said optical compensating means is held
by an angle adjustment means having a center portion of
said optical compensating means in the direction of
transmission of light as a first axis of rotation.
Claim 19
Dependent Claim
58 words
A liquid crystal projector as set forth in
claim 12, wherein a main light beam of illumination light
illuminated from said illumination optical system to said
liquid crystal panel is inclined with respect to a normal
line of said liquid crystal panel in response to an angle
of inclination of said phase delay axis or phase forward
axis.
Claim 20
Dependent Claim
37 words
A liquid crystal projector as set forth in
claim 12, wherein said angle of inclination of said phase
delay axis corresponds to the angular distribution of
light of the illumination optical system illuminating the
liquid crystal panel.
References Cited (Backward Citations)
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